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I have been looking through the forum and the guides and there seems some conflicting information.
its to do with the spanning tree and MLT, I have read that it should be off for an MLT and some say it should be ON.
or is it that spanning tree is on for all ports but the learning is off for the MLT, below is what I have run on the switch,
so I have two 5520 Stacked ( STK A ) with various VLANS then port 1/47,2/47 I have set as an MLT to another  switch stack ( STK B ) this uses 1/47 and 1/48 as the MLT
then from STK A I use ports 1/48,2/48 to connect to another  switch stack (STK C ) ports 1/47,1/48
the two  switch stacks are client stacks and have only one vlan ( or that's what it will be, My test setup is 2 switch Stack and then two stand alone switches. The info below if from the client switch

5520-48T-PWR(config)#mlt 1 name TRK-Stk-C-Stk-A
5520-48T-PWR(config)#mlt 1 me
5520-48T-PWR(config)#mlt 1 member 1/47,1/48
5520-48T-PWR(config)#mlt l
5520-48T-PWR(config)#mlt 1 learning disable
5520-48T-PWR(config)#mlt 1 enable
5520-48T-PWR(config)#spanning-tree mode rstp
5520-48T-PWR#save conf
5520-48T-PWR#copy conf nv
5520-48T-PWR#reload minutes-to-wait 1
5520-48T-PWR(config)#interface fastEthernet 1-46
5520-48T-PWR(config-if)#spanning-tree rstp port 1-46 edge-port true
5520-48T-PWR(config-if)#$ree bpdu-filtering port 6-44 enable timeout 60
5520-48T-PWR(config)#qos agent buffer large
5520-48T-PWR(config)#qos agent queue-set 2
5520-48T-PWR#save conf
5520-48T-PWR#copy conf nv
5520-48T-PWR#reload minutes-to-wait 1

520-48T-PWR(config)#sh running-config verbose module stp
! Embedded ASCII Configuration Generator Script
! Model = Ethernet Routing Switch 5520-48T-PWR
! Software version = v6.3.6.016
!
! Displaying all switch parameters
!====================================================
enable
configure terminal
!
! *** RSTP (Phase 1) ***
!
!The Spanning tree operation mode cannot be changed without rebooting.
!The Spanning tree operation mode is required to be set to RSTP before
!loading this ASCII configuration file.
spanning-tree mode rstp
spanning-tree rstp priority 8000
spanning-tree rstp version rstp
spanning-tree rstp forward-time 15 hello-time 2 max-age 20
spanning-tree rstp tx-holdcount 3
spanning-tree rstp pathcost-type bits32
no spanning-tree bpdu-filtering ignore-self
!
! *** RSTP (Phase 2) ***
!
spanning-tree rstp port ALL learning enable
spanning-tree rstp port 1-46 edge-port true
spanning-tree rstp port ALL priority 80
spanning-tree rstp port 47-48 edge-port false
spanning-tree rstp port ALL p2p auto
spanning-tree bpdu-filtering port 1-46 enable timeout 60
spanning-tree bpdu-filtering port 47-48 timeout 120
no spanning-tree bpdu-filtering port 47-48 enable
exit
5520-48T-PWR(config)#sh running-config verbose module mlt
! Embedded ASCII Configuration Generator Script
! Model = Ethernet Routing Switch 5520-48T-PWR
! Software version = v6.3.6.016
!
! Displaying all switch parameters
!====================================================
enable
configure terminal
!
! *** MLT (Phase 1) ***
!
no mlt
mlt 1 name "TRK-Stk-C-Stk-A" enable member 47-48
mlt 1 learning enable
mlt 1 bpdu all-ports
mlt 1 loadbalance basic

Some posts has said that STP should be disabled on the MLT but not on the port and others that say disable it on the MLT and the port.

And then to add even more confusion some say don't use MLT use LACP. All the switches I have are all AVAYA so should I stick with the MLT or is it better to use LACP ? or the LACP only really for when connecting to another Vendor i.e cisco/IBM etc
thanks for looking  :-\
2
Extreme / Avaya / Nortel Ethernet Switching / Re: ERS5650TD-PWR fans surging
« Last post by kthelen on Yesterday at 05:33:41 PM »
Decided to run one with the top off, just to see if I could isolate the issue better. Turns out it's only the center chassis fan that's doing the revving.

When power is applied, all the fans do the hi-lo speed test. Then the outer two idle, and the center one raises and lowers its speed endlessly as described. This begins within seconds of power-on, before the agent is even loading.
3
Extreme / Avaya / Nortel Ethernet Switching / Re: ERS5650TD-PWR fans surging
« Last post by TankII on Yesterday at 05:22:35 PM »
I have experienced this with the power supply fans, not chassis fans.  6.3.6 is solid, though the recommended code is 6.6.3 for 5600's.  You get lots of additional features like fabric attach proxy (which supports Extreme AP Zero-touch-provisioning), VRF-lite, and others.
When I was participating in the 5600 BETA, i asked a MIB for inlet temperature be added like the 8600 has.  Unfortunately, it is part of the mainboard and they could not do so.  It would have been useful to try and solve issues like this!


4
Extreme / Avaya / Nortel Ethernet Switching / Re: ERS5650TD-PWR fans surging
« Last post by kthelen on Yesterday at 03:01:33 PM »
>Anything via Console?

All the fans are listed as OK. Not sure what other things I might check... suggestions?


> Did you blow the fans and chassis out?

Yes.


> Is it the chassis or power supply fans that are noisy?

Chassis.


> I would try cleaning the units of all dust, just in case the internal thermistors are being set off due to hot spots.

Will give them a more thorough cleaning and see if that makes any difference.


> What code version are they on?

They were all on various versions when I got them (total of four, all from the same eBay seller - had only received the first two yesterday) and all behave exactly the same way. I cleared all their configs, and installed diagnostic 6.0.0.21 and agent 6.3.6.017s; no change.

I've never had any 5650s before, so I don't know what's normal or not. I do have a lot of 5520s, and a few 5698s, all of which run this same software, and all of which just hum along at a steady RPM when running.
5
Extreme / Avaya / Nortel Ethernet Switching / Re: ERS5650TD-PWR fans surging
« Last post by TankII on Yesterday at 02:26:49 PM »
Anything via Console?

Did you blow the fans and chassis out?

Is it the chassis or power supply fans that are noisy?

I would try cleaning the units of all dust, just in case the internal thermistors are being set off due to hot spots.

What code version are they on?
6
Extreme / Avaya / Nortel Ethernet Switching / ERS5650TD-PWR fans surging
« Last post by kthelen on February 13, 2019, 05:26:43 PM »
Just picked up a couple of used 5650TD-PWR units. Both of them seem to vary the speed of the fans, raising the RPMs for maybe 0.5 second every 2 seconds. Is this normal? Can they be configured to run at a steady speed?
7
What version of code are you running on this chassis?

Any other 8630 blades running on it?
Do you see any socket issues in the back of the chassis where maybe a pin bent and crossed in the past?
8
Extreme / Avaya / Nortel Ethernet Switching / Re: ERS55xxx - ASIC
« Last post by TankII on February 12, 2019, 12:37:35 PM »
ERS 5XXX and ES4XX switch ASICS are grouped, but not group-switched technology.  12 ports each ASIC, with 10 Gig and Cascade ports separate ASICs.  Wire-speed switching on each port forwarding to the backplane, so you won't overrun the port buffers if QOS is set correctly.

I would recommend setting your QOS as follows:
qos agent buffer large
qos agent queue-set 2

The 5600 can run lossless, the 5520 cannot.
Two queues will allow you to add another QOS service in the future - say Video or Voice.  When you do that, you will need to create a QOS interface group that is 'trusted' so all DSCP markings are passed transparently.
Example:
qos if-group name AV class trusted   
qos if-assign-list add portlist 1/1-1/38,2/35-2/38 name AV

TankII
9
Extreme / Avaya / Nortel Ethernet Switching / Re: Missing ARP records on Nortel 8310
« Last post by TankII on February 12, 2019, 12:25:32 PM »
Change your bridge timer to 21601 from 300 and see if that helps.

TankII
10
Avaya (Blue) / Nortel IP Telephony / Anyone running J169/J179's on CM 6.3?
« Last post by TankII on February 12, 2019, 12:21:02 PM »
We are about a year away from an upgrade from 6.3 to 8.X and want to deploy the new J-series phones at a site.

Has anyone had issues doing so?  Provisioning, Call quality, H.323 vs SIP?

Thanks in advance!
TankII
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